Improvement in middlings-purifiers



E. P. WELCH.

Middlings Purifiers.

N0.135,952, Patented Feb.18,187 3 AM. PHOTO-lITHOGRAPH/L 00. MY(osaanns'smocsss) UNITED STATEs PATENT OFFICE.

EDWARD P. WELOH, OF GEORGETOWN, nIsTRIoT OF COLUMBIA, AssIcnoR ToHIMSELF, JA Es H. WELOH, RosIA w. wELcH, HERBERT r. WELOH, AND JAMEs A.MALONEY, OF sAME PLACE.

IMPROVEMENT IN MlDDLlNGS-PURIFIERS.

Specification forming part of Letters Patent No. 135,952, dated February18, 1873.

To all whom it may concern:

Be it known that I, EDWARD PRIcE WELCH,

of Georgetown, in the District of Columbia,

have invented certain new and useful Improvements in Machinery forPurifying Mid-' dlin gs, of which the following is a specification Theinvention herein claimed constitutes an improvement upon the apparatusshown in Letters Patent of the United States, No. 133,- 509, granted tome November 26, 1872; and consists in combining with the rotary screentherein shown, brushes rotating across the face of the screen. Myinvention further consists in combining with said screen and brushes aperforated air-pipe surrounding the periphery of the screen, the blastfrom which counteracts the centrifugal action of the screen upon theflour and thus retards its discharge.

The accompanying drawing shows in Figure 1 a side elevation, partly insection, of my improved apparatus and Fig.2, a horizontal sectiontherethrough on the line 00 :c of Fig. 1.

The machine being fully described in the Letters Patent aforesaid thoseportions only relating to the subject-matter claimed will be hereindescribed. I

A screen, A, revolves upon a spindle, B.

One or more brushes, 0, (in this instance four are shown,) are mountedon spindles 1), so as to revolve in a plane substantially parallel tothe screen; but as the bristles are long and flexible an exactparallelism of movement of the brush and screen is not essential. Thecombined rotation of the screen and brush on independent axes produces aspiral scouring action on the screen, and, in combination with theblast, serves most effectually to clear both the screen and brush andthus prevents clogging. Aperforated pipe, E, surrounds the screen, and ablast through said pipe from a source by preference independent of theusual blast, which is also employed in this case, serves to counteractthe centrifugal action of the screen and prevent the too rapid escape ofthe flour therefrom.

It is obvious that a single large brush rotating faster than or in adirection opposite to that of the screen might be substituted for thebrushes shown in the drawing.

1. In a middlings-purifier, the combination of the rotaryscreen with aclearing brush or brushes rotating parallel therewith, substantially asset forth.

2. The combination, in a middlings-purifier, of the rotary screen withthe encircling jetpipe to counteract the centrifugal action of thescreen, substantially as before set forth.

In testimony whereof I have hereunto subscribed my name.

EDWARD P. WELGH.

Witnesses:

E. O. DAvInsoN, J OE I. PEYToN.

